ID   SSY1_SOLTU              Reviewed;         641 AA.
AC   P93568;
DT   01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT   01-MAY-1997, sequence version 1.
DT   04-NOV-2026, entry version 115.
DE   RecName: Full=Soluble starch synthase 1, chloroplastic/amyloplastic;
DE            EC=2.4.1.21;
DE   AltName: Full=Soluble starch synthase I;
DE            Short=SS I;
DE   Flags: Precursor;
OS   Solanum tuberosum (Potato).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Solanaceae; Solanoideae; Solaneae; Solanum.
OX   NCBI_TaxID=4113;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   STRAIN=cv. Desiree; TISSUE=Leaf;
RX   PubMed=10420646; DOI=10.1007/s004250050587;
RA   Kossmann J., Abel G.J.W., Springer F., Lloyd J.R., Willmitzer L.;
RT   "Cloning and functional analysis of a cDNA encoding a starch synthase from
RT   potato (Solanum tuberosum L.) that is predominantly expressed in leaf
RT   tissue.";
RL   Planta 208:503-511(1999).
CC   -!- FUNCTION: Plays a minor role in starch synthesis in storage organs
CC       (tubers), but may contribute to the deposition of transient starch in
CC       chloroplasts of leaves.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=[(1->4)-alpha-D-glucosyl](n) + ADP-alpha-D-glucose = [(1->4)-
CC         alpha-D-glucosyl](n+1) + ADP + H(+); Xref=Rhea:RHEA:18189, Rhea:RHEA-
CC         COMP:9584, Rhea:RHEA-COMP:9587, ChEBI:CHEBI:15378, ChEBI:CHEBI:15444,
CC         ChEBI:CHEBI:57498, ChEBI:CHEBI:456216; EC=2.4.1.21;
CC   -!- PATHWAY: Glycan biosynthesis; starch biosynthesis.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast. Plastid, amyloplast.
CC       Note=Amyloplast or chloroplast, soluble.
CC   -!- TISSUE SPECIFICITY: High expression in leaves and very low in tubers.
CC   -!- INDUCTION: Constant expression in light and darkness.
CC   -!- SIMILARITY: Belongs to the glycosyltransferase 1 family.
CC       Bacterial/plant glycogen synthase subfamily. {ECO:0000305}.
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DR   EMBL; Y10416; CAA71442.1; -; mRNA.
DR   PIR; T07668; T07668.
DR   RefSeq; NP_001275074.1; NM_001288145.1.
DR   AlphaFoldDB; P93568; -.
DR   SMR; P93568; -.
DR   FunCoup; P93568; 855.
DR   STRING; 4113.P93568; -.
DR   PaxDb; 4113-P93568; -.
DR   GeneID; 102600045; -.
DR   KEGG; sot:102600045; -.
DR   eggNOG; ENOG502QTWM; Eukaryota.
DR   InParanoid; P93568; -.
DR   OMA; AACEVFW; -.
DR   OrthoDB; 512920at2759; -.
DR   BioCyc; MetaCyc:MONOMER-1882; -.
DR   UniPathway; UPA00152; -.
DR   Proteomes; UP000011115; Unassembled WGS sequence.
DR   GO; GO:0009501; C:amyloplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0009507; C:chloroplast; IBA:GO_Central.
DR   GO; GO:0009011; F:alpha-1,4-glucan glucosyltransferase (ADP-glucose donor) activity; IBA:GO_Central.
DR   GO; GO:0004373; F:alpha-1,4-glucan glucosyltransferase (UDP-glucose donor) activity; IEA:InterPro.
DR   GO; GO:0010021; P:amylopectin biosynthetic process; IBA:GO_Central.
DR   GO; GO:0019252; P:starch biosynthetic process; IEA:UniProtKB-UniPathway.
DR   CDD; cd03791; GT5_Glycogen_synthase_DULL1-like; 1.
DR   FunFam; 3.40.50.2000:FF:000048; Starch synthase, chloroplastic/amyloplastic; 1.
DR   Gene3D; 3.40.50.2000; Glycogen Phosphorylase B; 2.
DR   HAMAP; MF_00484; Glycogen_synth; 1.
DR   InterPro; IPR001296; Glyco_trans_1.
DR   InterPro; IPR011835; GS/SS.
DR   InterPro; IPR013534; Starch_synth_cat_dom.
DR   NCBIfam; TIGR02095; glgA; 1.
DR   PANTHER; PTHR45825:SF11; ALPHA AMYLASE DOMAIN-CONTAINING PROTEIN; 1.
DR   PANTHER; PTHR45825; GRANULE-BOUND STARCH SYNTHASE 1, CHLOROPLASTIC/AMYLOPLASTIC; 1.
DR   Pfam; PF08323; Glyco_transf_5; 1.
DR   Pfam; PF00534; Glycos_transf_1; 1.
DR   SUPFAM; SSF53756; UDP-Glycosyltransferase/glycogen phosphorylase; 1.
PE   2: Evidence at transcript level;
KW   Amyloplast; Chloroplast; Glycosyltransferase; Plastid; Reference proteome;
KW   Starch biosynthesis; Transferase; Transit peptide.
FT   TRANSIT         1..?
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000255"
FT   CHAIN           ?..641
FT                   /note="Soluble starch synthase 1,
FT                   chloroplastic/amyloplastic"
FT                   /id="PRO_0000011142"
FT   BINDING         145
FT                   /ligand="ADP-alpha-D-glucose"
FT                   /ligand_id="ChEBI:CHEBI:57498"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   641 AA;  70608 MW;  30F8B0546CEFB74C CRC64;
     MGSLQTPTNL SNKSCLCVSG RVVKGLRVER QVGLGFSWLL KGRRNRKVQS LCVTSSVSDG
     SSIAENKNVS EGLLLGAERD GSGSVVGFQL IPHSVAGDAT MVESHDIVAN DRDDLSEDTE
     EMEETPIKLT FNIIFVTAEA APYSKTGGLG DVCGSLPMAL AARGHRVMVV SPRYLNGGPS
     DEKYANAVDL DVRATVHCFG DAQEVAFYHE YRAGVDWVFV DHSSYCRPGT PYGDIYGAFG
     DNQFRFTLLS HAACEAPLVL PLGGFTYGEK CLFLANDWHA ALVPLLLAAK YRPYGVYKDA
     RSIVAIHNIA HQGVEPAVTY NNLGLPPQWY GAVEWIFPTW ARAHALDTGE TVNVLKGAIA
     VADRILTVSQ GYSWEITTPE GGYGLHELLS SRQSVLNGIT NGIDVNDWNP STDEHIASHY
     SINDLSGKVQ CKTDLQKELG LPIRPDCPLI GFIGRLDYQK GVDIILSAIP ELMQNDVQVV
     MLGSGEKQYE DWMRHTENLF KDKFRAWVGF NVPVSHRITA GCDILLMPSR FEPCGLNQLY
     AMRYGTIPIV HSTGGLRDTV KDFNPYAQEG IGEGTGWTFS PLTSEKLLDT LKLAIGTYTE
     HKSSWEGLMR RGMGRDYSWE NAAIQYEQVF TWAFIDPPYV R
//